Long Brook at Underwood
EA name: SSN0948 LONG BROOK AT UNDERWOOD
Environment Agency sampling point SW-SSN0948 · Freshwater - rivers · listed as open (“open” does not mean it is sampled now)
These are samples taken on a date, not live readings of the river. Results reach the Environment Agency's archive days to months after the sample is taken, so the newest here may be weeks or months old. FloodRadar does not grade them.
Where and when
- Last sampled
- 11 Dec 2025, 12:1110 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone). Not sampled since, as far as the archive shows: the Environment Agency was asked up to 8 Oct 2026 and had nothing newer.
- Samples banked
- 14 since 14 Jan 2025 Imported periods: 1 Oct 2023 – 8 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (national agency policy)
- Where
- National Grid 253121, 56228As published, to the nearest 1 m. Open in a map
- River, by its own name
- Long Brook
- River, by the map
- Long BrookPlaced on the river its name gives, 3 m from the line.
- Next gauge downstream
- None tracedIts water reaches the sea without passing a gauge.
- Nearest gauge upstream
- Plympton On the Long Brook · 0.4 km along the river
- Why it was sampled
- Monitoring (national agency policy) (14 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
89.4%
Sampled 11 Dec 2025, 10 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Dec 2025, 12:11 | 89.4 | 89.4% |
| 6 Nov 2025, 10:24 | 87.1 | 87.1% |
| 21 Oct 2025, 10:22 | 86.2 | 86.2% |
| 25 Sep 2025, 12:10 | 90.5 | 90.5% |
| 5 Aug 2025, 12:41 | 100.5 | 100.5% |
| 18 Jul 2025, 14:28 | 106.7 | 106.7% |
| 27 Jun 2025, 13:34 | 95.6 | 95.6% |
| 30 May 2025, 12:25 | 100 | 100% |
| 14 Apr 2025, 11:51 | 98.1 | 98.1% |
| 31 Mar 2025, 11:34 | 95.4 | 95.4% |
| 12 Feb 2025, 11:45 | 92 | 92% |
| 14 Jan 2025, 12:15 | 94.5 | 94.5% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.5 mg/l
Sampled 11 Dec 2025, 10 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Dec 2025, 12:11 | 9.5 | 9.5 mg/l |
| 6 Nov 2025, 10:24 | 9.01 | 9.01 mg/l |
| 21 Oct 2025, 10:22 | 9.02 | 9.02 mg/l |
| 25 Sep 2025, 12:10 | 9.53 | 9.53 mg/l |
| 5 Aug 2025, 12:41 | 9.89 | 9.89 mg/l |
| 18 Jul 2025, 14:28 | 9.87 | 9.87 mg/l |
| 27 Jun 2025, 13:34 | 8.95 | 8.95 mg/l |
| 30 May 2025, 12:25 | 9.95 | 9.95 mg/l |
| 14 Apr 2025, 11:51 | 10.5 | 10.5 mg/l |
| 31 Mar 2025, 11:34 | 10.4 | 10.4 mg/l |
| 12 Feb 2025, 11:45 | 10.6 | 10.6 mg/l |
| 14 Jan 2025, 12:15 | 10.5 | 10.5 mg/l |
Water temperature
code 0076 · °C
12.5 °C
Sampled 11 Dec 2025, 10 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Dec 2025, 12:11 | 12.5 | 12.5 °C |
| 6 Nov 2025, 10:24 | 13.7 | 13.7 °C |
| 21 Oct 2025, 10:22 | 13.2 | 13.2 °C |
| 25 Sep 2025, 12:10 | 12.9 | 12.9 °C |
| 5 Aug 2025, 12:41 | 16 | 16 °C |
| 18 Jul 2025, 14:28 | 19 | 19 °C |
| 27 Jun 2025, 13:34 | 18.4 | 18.4 °C |
| 30 May 2025, 12:25 | 15.5 | 15.5 °C |
| 14 Apr 2025, 11:51 | 12.3 | 12.3 °C |
| 31 Mar 2025, 11:34 | 11.2 | 11.2 °C |
| 12 Feb 2025, 11:45 | 9 | 9 °C |
| 14 Jan 2025, 12:15 | 10.7 | 10.7 °C |
pH
code 0061
7.54
Sampled 11 Dec 2025, 10 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Dec 2025, 12:11 | 7.54 | 7.54 |
| 6 Nov 2025, 10:24 | 7.63 | 7.63 |
| 21 Oct 2025, 10:22 | 7.8 | 7.8 |
| 25 Sep 2025, 12:10 | 7.91 | 7.91 |
| 5 Aug 2025, 12:41 | 8.13 | 8.13 |
| 18 Jul 2025, 14:28 | 7.99 | 7.99 |
| 27 Jun 2025, 13:34 | 7.83 | 7.83 |
| 30 May 2025, 12:25 | 8.03 | 8.03 |
| 14 Apr 2025, 11:51 | 8.18 | 8.18 |
| 31 Mar 2025, 11:34 | 7.99 | 7.99 |
| 12 Feb 2025, 11:45 | 7.85 | 7.85 |
| 14 Jan 2025, 12:15 | 7.91 | 7.91 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.14 mg/l
Sampled 11 Dec 2025, 10 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Dec 2025, 12:11 | 0.14 | 0.14 mg/l |
| 6 Nov 2025, 10:24 | 0.046 | 0.046 mg/l |
| 21 Oct 2025, 10:22 | 0.084 | 0.084 mg/l |
| 25 Sep 2025, 12:10 | 0.057 | 0.057 mg/l |
| 5 Aug 2025, 12:41 | 0.036 | 0.036 mg/l |
| 18 Jul 2025, 14:28 | 0.042 | 0.042 mg/l |
| 27 Jun 2025, 13:34 | 0.055 | 0.055 mg/l |
| 30 May 2025, 12:25 | 0.035 | 0.035 mg/l |
| 14 Apr 2025, 11:51 | 0.041 | 0.041 mg/l |
| 31 Mar 2025, 11:34 | 0.048 | 0.048 mg/l |
| 12 Feb 2025, 11:45 | 0.1 | 0.1 mg/l |
| 14 Jan 2025, 12:15 | 0.041 | 0.041 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
3.88 mg/l
Sampled 11 Dec 2025, 10 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Dec 2025, 12:11 | 3.88 | 3.88 mg/l |
| 6 Nov 2025, 10:24 | 3.19 | 3.19 mg/l |
| 21 Oct 2025, 10:22 | 2.99 | 2.99 mg/l |
| 25 Sep 2025, 12:10 | 3.29 | 3.29 mg/l |
| 5 Aug 2025, 12:41 | 2.88 | 2.88 mg/l |
| 18 Jul 2025, 14:28 | 2.68 | 2.68 mg/l |
| 27 Jun 2025, 13:34 | 2.98 | 2.98 mg/l |
| 30 May 2025, 12:25 | 3.09 | 3.09 mg/l |
| 14 Apr 2025, 11:51 | 2.99 | 2.99 mg/l |
| 31 Mar 2025, 11:34 | 3.29 | 3.29 mg/l |
| 12 Feb 2025, 11:45 | 3.39 | 3.39 mg/l |
| 14 Jan 2025, 12:15 | 3.59 | 3.59 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.094 mg/l
Sampled 11 Dec 2025, 10 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Dec 2025, 12:11 | 0.094 | 0.094 mg/l |
| 6 Nov 2025, 10:24 | 0.076 | 0.076 mg/l |
| 21 Oct 2025, 10:22 | 0.094 | 0.094 mg/l |
| 25 Sep 2025, 12:10 | 0.072 | 0.072 mg/l |
| 5 Aug 2025, 12:41 | 0.11 | 0.11 mg/l |
| 18 Jul 2025, 14:28 | 0.1 | 0.1 mg/l |
| 27 Jun 2025, 13:34 | 0.084 | 0.084 mg/l |
| 30 May 2025, 12:25 | 0.089 | 0.089 mg/l |
| 14 Apr 2025, 11:51 | 0.067 | 0.067 mg/l |
| 31 Mar 2025, 11:34 | 0.057 | 0.057 mg/l |
| 12 Feb 2025, 11:45 | 0.076 | 0.076 mg/l |
| 14 Jan 2025, 12:15 | 0.046 | 0.046 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
472 µS/cm
Sampled 11 Dec 2025, 10 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Dec 2025, 12:11 | 472 | 472 µS/cm |
| 6 Nov 2025, 10:24 | 470 | 470 µS/cm |
| 21 Oct 2025, 10:22 | 458 | 458 µS/cm |
| 25 Sep 2025, 12:10 | 473 | 473 µS/cm |
| 5 Aug 2025, 12:41 | 472 | 472 µS/cm |
| 18 Jul 2025, 14:28 | 469 | 469 µS/cm |
| 27 Jun 2025, 13:34 | 477 | 477 µS/cm |
| 30 May 2025, 12:25 | 475 | 475 µS/cm |
| 14 Apr 2025, 11:51 | 481 | 481 µS/cm |
| 31 Mar 2025, 11:34 | 491 | 491 µS/cm |
| 12 Feb 2025, 11:45 | 480 | 480 µS/cm |
| 14 Jan 2025, 12:15 | 475 | 475 µS/cm |
Everything measured here
105 determinands, each kept by its code, unit and sample material: results in different units or on different materials are never mixed. A “below” result is under the laboratory's detection limit, not zero.
Show all 105 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 12 | Jan 2025 – Dec 2025 | 89.4% 11 Dec 2025 |
| Oxygen, Dissolved as O2 9924 | River water | 12 | Jan 2025 – Dec 2025 | 9.5 mg/l 11 Dec 2025 |
| Temperature of Water 0076 | River water | 12 | Jan 2025 – Dec 2025 | 12.5 °C 11 Dec 2025 |
| pH 0061 | River water | 12 | Jan 2025 – Dec 2025 | 7.54 11 Dec 2025 |
| Ammoniacal Nitrogen as N 0111 | River water | 12 | Jan 2025 – Dec 2025 | 0.14 mg/l 11 Dec 2025 |
| Nitrate as N 0117 | River water | 12 | Jan 2025 – Dec 2025 | 3.88 mg/l 11 Dec 2025 |
| Orthophosphate, reactive as P 0180 | River water | 12 | Jan 2025 – Dec 2025 | 0.094 mg/l 11 Dec 2025 |
| Conductivity at 25 C 0077 | River water | 12 | Jan 2025 – Dec 2025 | 472 µS/cm 11 Dec 2025 |
| 10:2 Fluorotelomer sulfonic acid 2994 | River water | 1 | Oct 2025 – Oct 2025 | below 0.002 µg/l 21 Oct 2025 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 2 | Apr 2025 – Oct 2025 | below 0.001 µg/l 21 Oct 2025 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 1 | Oct 2025 – Oct 2025 | below 0.001 µg/l 21 Oct 2025 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 2 | Apr 2025 – Oct 2025 | below 0.001 µg/l 21 Oct 2025 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 2 | Apr 2025 – Oct 2025 | below 0.0005 µg/l 21 Oct 2025 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 2 | Apr 2025 – Oct 2025 | below 0.0005 µg/l 21 Oct 2025 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 2 | Apr 2025 – Oct 2025 | below 0.001 µg/l 21 Oct 2025 |
| 2H-Perfluoro-2-decenoic acid 2888 | River water | 1 | Oct 2025 – Oct 2025 | below 0.001 µg/l 21 Oct 2025 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 2 | Apr 2025 – Oct 2025 | below 0.0005 µg/l 21 Oct 2025 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 2 | Apr 2025 – Oct 2025 | below 0.004 µg/l 21 Oct 2025 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 2 | Apr 2025 – Oct 2025 | below 0.001 µg/l 21 Oct 2025 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 2 | Apr 2025 – Oct 2025 | below 0.0005 µg/l 21 Oct 2025 |
| 5:3 Fluorotelomer betaine 2886 | River water | 1 | Oct 2025 – Oct 2025 | below 0.0005 µg/l 21 Oct 2025 |
| 6:2 Fluorotelomer phosphate diester 2986 | River water | 1 | Oct 2025 – Oct 2025 | below 0.004 µg/l 21 Oct 2025 |
| 6:2 Fluorotelomer sulfonamide betaine 2985 | River water | 1 | Oct 2025 – Oct 2025 | below 0.001 µg/l 21 Oct 2025 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 2 | Apr 2025 – Oct 2025 | below 0.001 µg/l 21 Oct 2025 |
| 6:2/8:2 Fluorotelomer phosphate diester 2884 | River water | 1 | Oct 2025 – Oct 2025 | below 0.01 µg/l 21 Oct 2025 |
| 6:6 Perfluorophosphinic acid 2883 | River water | 1 | Oct 2025 – Oct 2025 | below 0.004 µg/l 21 Oct 2025 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 2 | Apr 2025 – Oct 2025 | below 0.001 µg/l 21 Oct 2025 |
| 8:8 Perfluorophosphinic acid 2879 | River water | 1 | Oct 2025 – Oct 2025 | below 0.01 µg/l 21 Oct 2025 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 2 | Apr 2025 – Oct 2025 | below 0.0005 µg/l 21 Oct 2025 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 12 | Jan 2025 – Dec 2025 | 180 mg/l 11 Dec 2025 |
| Aluminium, Dissolved 6037 | River water | 3 | Apr 2025 – Oct 2025 | below 20 µg/l 21 Oct 2025 |
| Aminomethylphosphonic acid 7125 | River water | 9 | Apr 2025 – Dec 2025 | below 0.1 µg/l 11 Dec 2025 |
| Ammonia un-ionised as N 0119 | River water | 12 | Jan 2025 – Dec 2025 | 0.00108 mg/l 11 Dec 2025 |
| Barium, Dissolved 9446 | River water | 3 | Apr 2025 – Oct 2025 | below 10 µg/l 21 Oct 2025 |
| Boron, Dissolved 9447 | River water | 3 | Apr 2025 – Oct 2025 | below 100 µg/l 21 Oct 2025 |
| Cadmium, Dissolved 0106 | River water | 3 | Apr 2025 – Oct 2025 | below 0.01 µg/l 21 Oct 2025 |
| Calcium, Dissolved 0239 | River water | 3 | Apr 2025 – Oct 2025 | 65 mg/l 21 Oct 2025 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 12 | Jan 2025 – Dec 2025 | 1.2 mg/l 11 Dec 2025 |
| Chloride 0172 | River water | 12 | Jan 2025 – Dec 2025 | 27 mg/l 11 Dec 2025 |
| Chromium, Dissolved 3409 | River water | 3 | Apr 2025 – Oct 2025 | below 0.5 µg/l 21 Oct 2025 |
| Copper : BLM Bioavailable 4821 | River water | 3 | Apr 2025 – Oct 2025 | 0.23 µg/l 21 Oct 2025 |
| Copper, Dissolved 6450 | River water | 3 | Apr 2025 – Oct 2025 | 0.71 µg/l 21 Oct 2025 |
| eDNA Report 3047 | River water | 2 | Jan 2025 – Apr 2025 | 1 text result 14 Apr 2025 |
| Flow Type 2896 | River water | 12 | Jan 2025 – Dec 2025 | Moderate Flow 11 Dec 2025 |
| Glyphosate 3007 | River water | 9 | Apr 2025 – Dec 2025 | below 0.1 µg/l 11 Dec 2025 |
| Hardness, Calcium 0163 | River water | 3 | Apr 2025 – Oct 2025 | 162 mg/l 21 Oct 2025 |
| Hardness, Total as CaCO3 0158 | River water | 3 | Apr 2025 – Oct 2025 | 194 mg/l 21 Oct 2025 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 2 | Apr 2025 – Oct 2025 | below 0.001 µg/l 21 Oct 2025 |
| Hexafluoropropylene oxide trimer acid 2980 | River water | 1 | Oct 2025 – Oct 2025 | below 0.001 µg/l 21 Oct 2025 |
| Iron, Dissolved 6460 | River water | 3 | Apr 2025 – Oct 2025 | 70 µg/l 21 Oct 2025 |
| Lead : BLM Bioavailable 3377 | River water | 3 | Apr 2025 – Oct 2025 | 0.13 µg/l 21 Oct 2025 |
| Lead, Dissolved 0052 | River water | 3 | Apr 2025 – Oct 2025 | 0.13 µg/l 21 Oct 2025 |
| Lithium, Dissolved 4201 | River water | 3 | Apr 2025 – Oct 2025 | below 100 µg/l 21 Oct 2025 |
| Magnesium, Dissolved 0235 | River water | 3 | Apr 2025 – Oct 2025 | 7.6 mg/l 21 Oct 2025 |
| Manganese : BLM Bioavailable 4820 | River water | 3 | Apr 2025 – Oct 2025 | 16 µg/l 21 Oct 2025 |
| Manganese, Dissolved 6458 | River water | 3 | Apr 2025 – Oct 2025 | 23 µg/l 21 Oct 2025 |
| Mitochondrial marker : Fish 12S 2857 | River water | 2 | Jan 2025 – Apr 2025 | Present 14 Apr 2025 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 2 | Apr 2025 – Oct 2025 | below 0.002 µg/l 21 Oct 2025 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 2 | Apr 2025 – Oct 2025 | below 0.002 µg/l 21 Oct 2025 |
| Nickel : BLM Bioavailable 3878 | River water | 3 | Apr 2025 – Oct 2025 | 0.11 µg/l 21 Oct 2025 |
| Nickel, Dissolved 3410 | River water | 3 | Apr 2025 – Oct 2025 | below 0.5 µg/l 21 Oct 2025 |
| Nitrite as N 0118 | River water | 12 | Jan 2025 – Dec 2025 | 0.022 mg/l 11 Dec 2025 |
| Nitrogen, Total as N 9686 | River water | 12 | Jan 2025 – Dec 2025 | 4.6 mg/l 11 Dec 2025 |
| Nitrogen, Total Oxidised as N 0116 | River water | 12 | Jan 2025 – Dec 2025 | 3.9 mg/l 11 Dec 2025 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 2 | Apr 2025 – Oct 2025 | below 0.0005 µg/l 21 Oct 2025 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 2 | Apr 2025 – Oct 2025 | below 0.0005 µg/l 21 Oct 2025 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 2 | Apr 2025 – Oct 2025 | below 0.0005 µg/l 21 Oct 2025 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 2 | Apr 2025 – Oct 2025 | below 0.0005 µg/l 21 Oct 2025 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 2 | Apr 2025 – Oct 2025 | below 0.0005 µg/l 21 Oct 2025 |
| Perfluorobutanesulfonic acid 2972 | River water | 2 | Apr 2025 – Oct 2025 | 0.0021 µg/l 21 Oct 2025 |
| Perfluorobutanoic acid 2995 | River water | 2 | Apr 2025 – Oct 2025 | 0.0015 µg/l 21 Oct 2025 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 2 | Apr 2025 – Oct 2025 | below 0.0005 µg/l 21 Oct 2025 |
| Perfluorodecanesulfonic acid 2969 | River water | 2 | Apr 2025 – Oct 2025 | below 0.001 µg/l 21 Oct 2025 |
| Perfluorodecanoic acid 8892 | River water | 2 | Apr 2025 – Oct 2025 | below 0.001 µg/l 21 Oct 2025 |
| Perfluorododecane sulfonic acid 2968 | River water | 2 | Apr 2025 – Oct 2025 | below 0.005 µg/l 21 Oct 2025 |
| Perfluorododecanoic acid 8894 | River water | 2 | Apr 2025 – Oct 2025 | below 0.002 µg/l 21 Oct 2025 |
| Perfluoroheptanesulfonic acid 2967 | River water | 2 | Apr 2025 – Oct 2025 | below 0.0005 µg/l 21 Oct 2025 |
| Perfluoroheptanoic acid 8889 | River water | 2 | Apr 2025 – Oct 2025 | below 0.001 µg/l 21 Oct 2025 |
| Perfluorohexanesulfonamide 2965 | River water | 2 | Apr 2025 – Oct 2025 | below 0.0005 µg/l 21 Oct 2025 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 2 | Apr 2025 – Oct 2025 | below 0.0005 µg/l 21 Oct 2025 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 2 | Apr 2025 – Oct 2025 | 0.00071 µg/l 21 Oct 2025 |
| Perfluorohexanoic acid 8888 | River water | 2 | Apr 2025 – Oct 2025 | 0.0012 µg/l 21 Oct 2025 |
| Perfluorononanesulfonic acid 2963 | River water | 2 | Apr 2025 – Oct 2025 | below 0.0005 µg/l 21 Oct 2025 |
| Perfluorononanoic acid 8891 | River water | 2 | Apr 2025 – Oct 2025 | below 0.001 µg/l 21 Oct 2025 |
| Perfluorooctadecanoic acid 2962 | River water | 2 | Apr 2025 – Oct 2025 | below 0.002 µg/l 21 Oct 2025 |
| Perfluorooctanesulfonamide 2961 | River water | 2 | Apr 2025 – Oct 2025 | below 0.001 µg/l 21 Oct 2025 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 2 | Apr 2025 – Oct 2025 | 0.0012 µg/l 21 Oct 2025 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 2 | Apr 2025 – Oct 2025 | 0.00098 µg/l 21 Oct 2025 |
| Perfluorooctanesulfonic acid (total) 2958 | River water | 1 | Oct 2025 – Oct 2025 | 0.0022 µg/l 21 Oct 2025 |
| Perfluorooctanoic acid 8890 | River water | 2 | Apr 2025 – Oct 2025 | 0.0015 µg/l 21 Oct 2025 |
| Perfluoropentanesulfonic acid 2957 | River water | 2 | Apr 2025 – Oct 2025 | below 0.0005 µg/l 21 Oct 2025 |
| Perfluoropentanoic acid 8887 | River water | 2 | Apr 2025 – Oct 2025 | 0.0015 µg/l 21 Oct 2025 |
| Perfluorotetradecanoic acid 8895 | River water | 2 | Apr 2025 – Oct 2025 | below 0.006 µg/l 21 Oct 2025 |
| Perfluorotridecanoic acid 2955 | River water | 2 | Apr 2025 – Oct 2025 | below 0.002 µg/l 21 Oct 2025 |
| Perfluoroundecane sulfonic acid 2953 | River water | 2 | Apr 2025 – Oct 2025 | below 0.004 µg/l 21 Oct 2025 |
| Perfluoroundecanoic acid 8893 | River water | 2 | Apr 2025 – Oct 2025 | below 0.001 µg/l 21 Oct 2025 |
| Phosphorus, Total as P 0348 | River water | 12 | Jan 2025 – Dec 2025 | 0.12 mg/l 11 Dec 2025 |
| Potassium, Dissolved 0209 | River water | 3 | Apr 2025 – Oct 2025 | 2.9 mg/l 21 Oct 2025 |
| Silica, reactive as SiO2 0182 | River water | 12 | Jan 2025 – Dec 2025 | 8.3 mg/l 11 Dec 2025 |
| Sodium, Dissolved 0205 | River water | 3 | Apr 2025 – Oct 2025 | 17 mg/l 21 Oct 2025 |
| Solids, Suspended at 105 C 0135 | River water | 12 | Jan 2025 – Dec 2025 | 14 mg/l 11 Dec 2025 |
| Strontium, Filtered 6693 | River water | 3 | Apr 2025 – Oct 2025 | 200 µg/l 21 Oct 2025 |
| Sulphate, Dissolved as SO4 7859 | River water | 3 | Apr 2025 – Oct 2025 | 21 mg/l 21 Oct 2025 |
| Zinc : BLM Bioavailable 4822 | River water | 3 | Apr 2025 – Oct 2025 | 1.4 µg/l 21 Oct 2025 |
| Zinc, Dissolved 3408 | River water | 3 | Apr 2025 – Oct 2025 | 2 µg/l 21 Oct 2025 |
FloodRadar does not grade these results: there is no overall score, and official river classifications are a separate dataset. A sample taken downstream of an overflow does not by itself show where anything in it came from. River connections and distances are traced on OS Open Rivers (edition 2026-04), which leaves out many small channels.
Water samples: Environment Agency Water Quality Archive, © Environment Agency and/or database right 2026, Open Government Licence v3.0.
Contains OS data © Crown copyright and database rights 2026.